﻿namespace MsgBox.View.Modern.Windows.Converters
{
  using System;
  using System.Diagnostics.CodeAnalysis;
  using System.Windows.Data;

  /// <summary>
  /// Converts string values to lower case.
  /// </summary>
  public class ToLowerConverter
      : IValueConverter
  {
    /// <summary>
    /// Converts a value.
    /// </summary>
    /// <param name="value">The value produced by the binding source.</param>
    /// <param name="targetType">The type of the binding target property.</param>
    /// <param name="parameter">The converter parameter to use.</param>
    /// <param name="culture">The culture to use in the converter.</param>
    /// <returns>
    /// A converted value. If the method returns null, the valid null value is used.
    /// </returns>
    [SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase")]
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      if (value != null)
      {
        var strValue = value.ToString();


        return strValue.ToLowerInvariant();
      }
      return null;
    }

    /// <summary>
    /// Converts a value.
    /// </summary>
    /// <param name="value">The value that is produced by the binding target.</param>
    /// <param name="targetType">The type to convert to.</param>
    /// <param name="parameter">The converter parameter to use.</param>
    /// <param name="culture">The culture to use in the converter.</param>
    /// <returns>
    /// A converted value. If the method returns null, the valid null value is used.
    /// </returns>
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      throw new NotSupportedException();
    }
  }
}
